Lee Chang-sub (Korean: 이창섭; born February 26, 1991), better known mononymously as Changsub, is a South Korean singer, musical actor and entertainer. He is a lead vocalist of the South Korean boy group, BtoB.
Lee Changsub was born in Suwon, Gyeonggi-do, South Korea. He studied Practical Music at Howon University with BTOB group-mate Lim Hyunsik. They both got admitted in 2011 with a cutthroat 3000:5 ratio at that time.
Prior to his debut as an idol, he won a Daesang at the 16th Suwon Music Festival 2008, and even became vice president of Red Cross Youth Gyeonggi Province in 2009.
He began his military duty by enlisting as an active duty soldier on January 14, 2019. On July 24, Lee recorded a special single— a new theme song for the ROK Army alongside Shinee’s Onew and Key, Exo’s Xiumin, Infinite’s Kim Sung-kyu, 2AM’s Jo Kwon and Jinwoon, Yoon Ji-sung and actors Kim Minseok, and Lee Jae-kyoon.
On October 21, 2017, Lee Chang-sub visited his alma mater and delivered a scholarship of ₩10 million to his high school alma-mater, Samil Commercial High School. Changsub said, “I couldn’t have imagined this when I was in school. It’s an honor to be in a situation where I’m able to deliver this scholarship for the younger generation of students. I’ve been able to come this far thanks to my teachers and my school who helped me until the end when I was a student.”